Dental appliance.



No. 724,838. PATENTED APR. .7 21903 Y S. E. FISH.

DENTAL APPLIANCE APPLICATION FILED NOV. 25, 1902.

UNITED STATES PATENT OFFICE.

' SIDELL- E. FISH, OF GREENPORT, NEW YORK.

DENTAL APPLIANCE.

SPECIFICATION forming part of Letters Patent N 0. 724,838, dated April'7, 1903.

Application filed November 25,1902. 'Serial No. 132,734. (llo model.)

To all whom, it may concern.-

Be it known that I, SIDELL E. FISH, a citizen of the United States,residing at Greenport, Suffolk county, State of New York, have inventedcertain new and useful Improvements in Disks and Disk-Holders, of whichthe following is a specification.

My invention refers to dental appliances, and more particularly to meansfor attaching dental disks used for polishing teeth and the fillings ofteeth to the revolving shafts of dental engines, which means orappliances are commonly designated as dental disk-mandreis.

Dental disks are usually made of paper covered with a suitable coatingcomprising emery or the like and have heretofore generally been providedwith a central circular perforation fitting a shank detachablyconnectedwith the revolving shaft of a dental engine and have been heldagainst a shoulder on said shank by devices depending upon frictionalengagement between portions of the mandrel or by screw-thread.

The objects of my invention are to so construct the portions of a dentaldisk-mandrel which serve to confine the dental disk in its operativeposition as to secure locking contact and engagement between the samewhile holding said disk in place and to permit of promptly and easilyattaching a disk to said mandrel and of detaching it therefrom. Iaccomplish these and other useful objects by the means hereinafterdescribed, and set forth more particularly in the claims.

In the accompanying drawings,wherein corresponding reference-figuresrefer to corresponding parts, Figure 1 is a side view of a dentalappliance comprising a disk-mandrel and a dental disk, all constructedaccording to my invention, while Fig. 2 is a longitudinal sectionthereof. Fig. 3 is an end view, partlyin section, of a portion of themandrel and of connecting parts; and Fig. 4., a face View of a dentaldisk adapted to be used in connection with my improved dental appliance.

In the drawings, is a shank capable of being attached at one end to therevolving shaft of a dental engine and having fixedly secured to itsother end a metal disk 11.

12 is a'collar riveted to the central portion of said shank.

13 is a sleeve revolubly mounted upon said shank between disk 11 andcollar 12.

14 isa pointed studprovided with a head 15 and an eye 16, made of thinwire and placed close to and connecting with said head and so extendingalong said stud as to place said eye substantially in the centrallongitudinal plane of'said stud. Said stud fits into and is adapted tobe inserted in alongitudinal perforation 17 within shank 10 in suchmanner that thereby a dental disk 18 may becon fined between disk 11 andhead 15.

19 isaspiral spring having one end fixedly attached to sleeve 13 andbeing coiled around the portion of shank 10 between sleeve 13 and disk11, so as to bring its free end adjacent to said disk. It is coiledloosely, so as to permit of its being forced to some extent toward saidsleeve. Disk 11 is so perforated as to permit of forcing through it stud14 and eye 16 as said stud is being inserted in shank 10 after firstplacing dental disk 18 between head 15 and said disk.

I apply my dental disk and I insert stud 14 in perforation 17 while theshaft of the engine, and with it disk ll, is revolving, pressing head 15toward disk 11 until eye 16 passes through the perforation in said diskand comes to rest against the end coil of spring 19 and depresses thelatter until the free end of the coil finally passes into eye 16 anddraws the .eye,and with ithead 15, toward disk 11,whereby, owing to theelasticity of said spring, head 15 is finally firmly secured in aposition closely adjoining dental disk 18, so as to hold the latter inits operative position and in contact with disk 11. It will thus be seenthat the free end of spring 19 forms a yielding arm movable withreference to the shank and which in passing through eye 16 draws saideye, and with it head 15, toward sleeve 13 and locks said head in itsproper position in close contact with the dental disk and that suchlocking operation will thus be performed no matter what he the thicknessof said dental disk. It will also be observed that theportion 20 of eye16 which runs substantially parallel with head 15 looks with spring 19,while portion 21 of said eye serves to reinforce portion 20 and also inpassing through dental disk 18 while the latter is confined betweenparts 11 and 15 serves to further steady said disk and prevent it fromrevolving around stud 14.

While eye 16 might be permitted to enforce its passage through dentaldisk 18 while stud 14 is entering perforation 17, I prefer to originallyconstruct said disk with a perforation, as shown more particularly inFig. 4:, which comprises a circular hole 22, fitting stud 14, and inaddition a slit 23, communicating with said circular perforation andfitting part 20 of eye 16 and said eye in general. I thus avoid theformation of a bur on disk 18,which might interfere with properlyconfining it in its place.

By having the perforation in the disk so shaped before applying it tothe disk-holder as to conform with stud 14 and eye 16 even slightrevolving of the disk around said stud will be guarded against.

It will readily be seen that the details of my improved dental appliancemight be varied in many respects without departing from the spirit of myinvention, and I therefore do not wish to confine myself to the detailsabove described. When the dental disk is to be detached from themandrel, this can be done by holding sleeve 13 in one hand and reversingthe direction of the revolution of the dental shaft, whereby spring 19will become disengaged from eye 16, so as to permit of Withdrawing stud1% from socket 17, and consequently freeing disk 18 from its engagementwith disk 11 and head 15.

I claim 1. In a dental disk-mandrel, the combination with ashank adaptedto be attached to the shaft of a dental engine, of a stud having asuitable head and adapted to be inserted in said shank and to beentirely detached therefrom, a projection on said stud, and alocking-arm attached to and capable of moving with reference to theshank and adjusted to engage with said projection.

2. In a dental disk-mandrel, the combination with a shank adapted to beattached to the shaft of a dental engine of a stud with suitable headand adapted to be inserted in said shank, a projection on said stud, andan elastic locking-arm adjusted to be brought in looking contact withsaid projection during revolution of said shank with reference to saidstud.

3. In a dental disk-mandrel, the combination with ashank adapted to beattached to the shaft of a dental engine, of a stud having a suitablehead and adapted to be inserted in said shank, a projection on said studand a locking-arm attached to and capable of moving with reference tothe shank and adjusted to successively engage with opposite surfacesSIDELL E. FISH.

Witnesses:

CHAS. L. IIORACK, EDWARD A. PEIRCE.

